4G band selection:
FDD-LTE-BAND:1/2/3/4/5/7/8/12/13/18/19/20/25/26/28/66/34/38/39/40/41
GSM:850/900/1800/1900
4 working modes can be switched at will:
1. Instant mode = fast mode: WKMD, 1,30 (real-time tracking when using the device, upload data every 30 seconds, upload frequency is 30 seconds-120 seconds)
2. Super power saving mode = roll call mode: WKMD,2,0 (when not using the device, use this mode. Upload data through APP roll call function)
3. Power saving mode = exercise upload mode: WKMD, 3, 10 (data is uploaded once every 10 minutes of exercise, and can be changed from 10 minutes to 1440 minutes)
4. Timed upload mode=timed upload: WKMD,4,4 (the time range is between 1 hour and 24 hours, and the data is uploaded every 4 hours)